When a body is connected to the earth, then electrons from the earth, fl ow into the body. It means that the body is [1] (a) unchanged (b) an insulator (c) positively charged (d) negatively charged.

a. a primary source combines several different accounts of an event. b. a primary source generally benefits from having been written after an event.

explanation:

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.